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Summary

Resolves #290

/claim #290

Integrates AWS Comprehend PII redaction utility into EdgeChains JavaScript / TypeScript SDK:

• ComprehendRedaction: Core redaction utility using AWS Comprehend DetectPiiEntitiesCommand (with mockable client and local pattern fallback) to mask or redact sensitive PII entities (email, phone, SSN, names, etc.) while preserving offset alignment.
• AwsComprehendRedactor: Observable/chainable utility providing a .chain(prompt) / .observe(prompt) interface to sanitize prompts before LLM endpoint execution.
• Tests: Comprehensive unit tests in JS/edgechains/arakoodev/src/ai/src/tests/comprehendRedactor.test.ts verifying entity redaction, custom masking, clean passthrough, and empty input handling.
• Example: Full working runnable demonstration in JS/edgechains/examples/comprehend-redactor/index.ts.

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